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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b12905b4b022e9d9f6465653c3a32cb31d77fb4f07e8eaee2e7d449d6e5ec5' 
  AND token = '2fxTndZV7SvFjFDQNRsZFvUOh0+MmWSLP/CIhU0DcCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}